装卸作业时，严禁向上或向下抛洒材料和工具等物件，防止伤及到人员。

Liuxiang earned the respect from the whole world as he hopped down the track to the finishing line, ____the last hurdle.

A．kissed

B．to kiss

C．kissing

D．having kissed

下列关于危险废物贮存设施（仓库式）的设计原则叙述不正确的是（）。

A.必须有泄漏液体收集装置、气体导出口及气体净化装置

B.设施内要有安全照明设施和观察窗口

C.用以存放装载液体、半固体危险废物容器的地方，必须有耐腐蚀的硬化地面，且表面无缝隙

D.应设计堵截泄漏的裙脚，地面与裙脚所围建的容积不低于堵截最大容器的最大储量或总储量的1/4

为了调查初中一年级学生每天用于完成课外书面作业的时间，在某校初一 （2）班随机抽查了8名学生，他们每天用于完成课外书面作业所需时间（单位：分钟）分别为：60，55，30，75，55，55，65，45，

（1）求这组数据的众数、中位数；

（2）求这8名学生每天用于完成课外书面作业的平均时间；如果按照学校要求，初中一年级学生平均每天用于完成课外书面作业所需时间不能多于60分钟，问该班学生每天用于完成课外书面作业所需的平均时间是否符合学校的要求？

由于太湖沿岸的一些企业向太湖过量排污，造成无锡市近百万市民家中的自来水系统受到蓝藻污染而无法饮用。这一事件告诉我们，政府必须

A．搞好社会公共服务，保护公共环境

B．组织和领导社会主义文化建设

C．组织社会主义经济建设

D．正确处理人民内部矛盾，维护社会稳定

Naturally, in a group of animals as diverse as the snakes, and with so many varied enemies, there are numerous defensive reactions and devices. There is, however, one general pattern of behavior. In the presence of suspected enemy the first reaction is to try to escape observation; if this fails, the next resort is the flight to some inaccessible retreat, but if this is not possible, or is circumvented, various kinds of intimidatory gestures and warning devices are brought into play; in the last resort the snake attacks. This pattern varies with the circumstances; some stages may be omitted or combined unpredictably whilst; some notoriously irascible species may dispense

with all the preliminaries

and attack almost at once, though seldom or never without some provocation.

Amongst the factors that increase aggressiveness are hunger, the mating season and surprise, with the last mentioned the commonest; when hunting for food or for mate, activity and the aggressive instinct are both at their peak. Owing to their poor sense of hearing snakes are very liable to be, quite literally, caught napping and a similar situation arises during their periods of temporary blindness just before slough- ing (蜕皮) begins. By far the greatest number of snake-bit accidents result from the unwitting disturbance of resting snakes, and this hazard is much increased with species that are well disguised and whose natural instinct is to trust to this concealment as their principal defense. As well as differences in aggressiveness between individuals of the same species according to the circumstances and conditions, there are also no- table differences between species, even closely allied species; and the reports of those who have been at- tacked may understandably be lacking in objectivity. So it is impossible to forecast, even in outline, how any encounter will develop.

The Hamadryad, for example, is usually credited with being amongst the most aggressive of snakes, and there are many accounts of unprovoked attacks, yet on one occasion fourteen men and seven dogs passed and returned within two yards from a nest and no snake was seen although the female, which guards the nest, could not have been far away.

The author uses the example in the last paragraph to support his idea that().

A. snakes do not begin the aggressive act if it is not disturbed.

B. some snakes are more aggressive and more ready to attack.

C. it is hard to forecast whether and how snakes would attack.

D. snakes often conceal themselves as their principal defense.